“This paper uses evidence from a firm survey conducted in a number of EU countries to investigate a range of different theories as to why firms appear reluctant to lower wages. The sample covers 14,975 firms from 14 European countries, representing around 47.3 million employees. .... Across all countries and sectors, the two most important causes for avoiding base wage cuts are the belief that this would result in a reduction in morale or effort and the danger that the most productive workers would leave as a consequence.” (Du Caju et al. 2013: 2).

“We conducted a field experiment to test whether workers reciprocate wage cuts and raises with low or high work productivity. Wage cuts had a detrimental and persistent impact on productivity, reducing average output by more than 20%.” (Kube et al. 2013: 853).

“A survey of 184 firms was conducted to investigate the reasons for wage rigidity. The strongest support was found for explanations based on adverse selection in quits and on the effect of wages on effort. In addition, survey respondents indicated that reducing turnover is an important explanation of wage rigidity for white-collar workers, and that implicit contracts are an important explanation for other workers.” (Campbell 1997: 759).

“We document the results of a repeat survey, which updates Agell and Lundborg (1995), on wage rigidity in a sample of 159 Swedish manufacturing firms, conducted during the severe Swedish recession of the 1990s. It is found that not even a prolonged period of very high unemployment and quite low inflation softened workers’ resistance to wage cuts.” (Agell and Lundborg 2003: 15).